Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, va cam, ve cai
di cuu » di cau, di cua, dinh cuu
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu ((ve cam) OR (ve cac)) duc ((va hanh) or (va thanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((ve cam) OR (ve cac)) duc ((va hanh) OR (va thanh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((ve cam) OR (ve cac)) duc ((va hanh) or (va thanh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((ve cam) OR (ve cac)) duc ((va hanh) or (va thanh)) di cuu tre*.